1/*
2 * Copyright (c) 2008, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23package org.graalvm.compiler.jtt.jdk;
24
25import jdk.vm.ci.meta.ResolvedJavaMethod;
26
27import org.junit.Test;
28
29import sun.misc.Unsafe;
30
31import org.graalvm.compiler.jtt.JTTTest;
32
33public class Unsafe_compareAndSwap extends JTTTest {
34
35    static final Unsafe unsafe = UnsafeAccess01.getUnsafe();
36    static final long valueOffset;
37    static {
38        try {
39            valueOffset = unsafe.objectFieldOffset(Unsafe_compareAndSwap.class.getDeclaredField("value"));
40        } catch (Exception ex) {
41            throw new Error(ex);
42        }
43    }
44
45    public static String test(Unsafe_compareAndSwap u, Object o, String expected, String newValue) {
46        // First arg is not an array - can use a field write barrier
47        unsafe.compareAndSwapObject(u, valueOffset, expected, newValue);
48        // Not known if first arg is an array - different write barrier may be used
49        unsafe.compareAndSwapObject(o, valueOffset, expected, newValue);
50
51        return instance.value;
52    }
53
54    private String value;
55
56    private static final Unsafe_compareAndSwap instance = new Unsafe_compareAndSwap();
57
58    @Override
59    protected void before(ResolvedJavaMethod m) {
60        instance.value = "a";
61    }
62
63    @Test
64    public void run0() throws Throwable {
65        runTest("test", instance, instance, "a", "b");
66    }
67}
68